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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 161,
    "wlbName" : "17/10-1",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 17/10-1 is situated in the\r\nNorwegian- Danish Basin near the western margin of the Sele High, which is a\r\nshallow basement feature. The structure on which the well was drilled is a very\r\ngentle anticline in an area with prominent salt walls. The objective of the\r\n17/10-1 well was to test the Mesozoic section.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 17/10-1 was spudded with the\r\nsemi-submersible installation Sedneth I and drilled to TD at 3590 m in the\r\nTriassic Smith Bank Formation. The hole was drilled with a 18 1/2" bit to\r\n160 m, but during enlarging with a 36" hole opener the temporary guide\r\nbase sank 2.5 m into the seabed and tilted, due to heavy washing out. This made\r\nit impossible to enter the hole and the rig was moved 30 m NNE of its original\r\nposition where a new hole was spudded. An 18 1/2" hole was drilled to 430\r\nm. Seawater was used as drilling fluid and the returns were to the sea floor.\r\nThereafter the mud system was converted to a Spersene/XP-20 seawater mud. At\r\n3367 m the mud was converted to a salt saturated system since this was below\r\nthe prognosed depth for top Zechstein salt. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe chief reservoir zone of interest was\r\nthe massive Jurassic/Triassic sandstone (Gassum and Skagerrak Formations) from\r\n2682 m to 3405 m. This section had porosities mainly between 20 % and 25 % and\r\nwas entirely water bearing. There is a major unconformity on top of these sands\r\nto the overlying Late Jurassic shales. The claystone section from about 2651 m\r\nto 2682 m (Tau and Egersund Formations) had an exceptionally high gamma ray\r\nwith readings up to 300 API units. Resistivities varied between 2 and 7 ohm/m\r\ncompared with 1 - 1.5 ohm/m for the overlying shales. Cuttings from this\r\nsection were very carbonaceous and were bleeding gas when first examined. Chromatograph\r\nreadings were up to 700 ppm C1 with small quantities of C2, C3, and C4. Above\r\nand below this section the C1 reading was about 300 ppm. Nearly 700 m of Lower\r\nCretaceous s",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}